Feature:1. The bottom is made of zinc alloy, which is durable, anticorrosion, withstands high pressure without water seepage, water leakage, etc.2. Use silver material double contact, (the contact is 15sided contact point is more stable than the single round ), ensures the strength.3. Large contacts for longer servicing life open on rising pressure, avoid frequent start of the switch.4. Self priming, smooth, silent operation and can run dry without damage, stable and reliable.5. Standard water pump replacement switch designed for use of electrically driven water pumps of most types.Specification:Item Type: Water Pump SwitchMaterial: Zinc AlloySpecification: 2.2-3.0kg /4.8-6.6lb (Suitable for 550W 750W)Interface Thread Specification: 3/8inUsage: This switch is suitable for automatic cold and hot water self-priming booster pumps of major brands at home and abroad, for internal and external threaded bend.Package List:1 xWater Pump SwitchNote:The switch is suitable for automatic cold and hot water selfpriming booster pumps of major brands at home and abroad, for internal and external threaded elbow.